In reply to Donald82:
I don't think the route is 80 miles, the Rat Race Wall Ultra is 69 miles.
A friend of mine, a 45 year old mid pack fell running lady ran it in under 13 hours a couple of years ago. Easy terrain and not all that hilly. By comparison, she took 19 hours on the similar distance UT 110 in the Lakes, which had 14,000' of ascent.